SQL查询统计某表的男女各个人数

select s.sex,count(s.sex) from student s GROUP BY sex;

GROUP BY 语句

GROUP BY 语句用于结合合计函数，根据一个或多个列对结果集进行分组。

测试student表纪录如下图，根据自己需求增删字段。

统计男女人数sql如下图：

student s ,s是自己为student表定义的别名，count()为统计的人数。

拓展资料：

SQL GROUP BY 语法：

SELECT column_name（列名）, aggregate_function(column_name) （函数名）  FROM table_name（表名）  WHERE column_name operator value GROUP BY column_name

select sum(case when 性别='男' then 1 else 0 end) as 男人数,
sum(case when 性别='女' then 1 else 0 end) as 女人数 from student

select 性别,count(性别) from student group by 性别

select sex,count(sex) from student group by sex

结果如下
-----------------
sex Expr1
男 ....
女 ....

select sex,count(*) from student group by sex